CA1293368C - Device for releasably clamping a cutting insert on a tool-holder - Google Patents
Device for releasably clamping a cutting insert on a tool-holderInfo
- Publication number
- CA1293368C CA1293368C CA000555531A CA555531A CA1293368C CA 1293368 C CA1293368 C CA 1293368C CA 000555531 A CA000555531 A CA 000555531A CA 555531 A CA555531 A CA 555531A CA 1293368 C CA1293368 C CA 1293368C
- Authority
- CA
- Canada
- Prior art keywords
- tool holder
- insert
- hole
- screw
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1662—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the cutting insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/04—Fixation screws, bolts or pins of particular form
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
- Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
- Y10T407/2274—Apertured tool
- Y10T407/2276—Apertured tool with means projecting through aperture to force tool laterally against reaction surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
- Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
- Y10T407/2274—Apertured tool
- Y10T407/2276—Apertured tool with means projecting through aperture to force tool laterally against reaction surface
- Y10T407/2278—Tilting clamp element and separate means to tilt same
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Turning (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Telephone Function (AREA)
- Sampling And Sample Adjustment (AREA)
- Jigs For Machine Tools (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to a device for relea-sably clamping a cutting insert on a tool-holder, device comprising a screw of which the threaded shank adapted to be screwed in a tapped hole in the tool-holder passes through an eccentric cylin-drical hole in the insert. According to the inven-tion, the head of the screw comprises, from the shank, a truncated bearing surface, a cylindrical bearing surface and a shoulder, adapted to cooperate with the edge and the wall of the eccentric hole in the insert, to press the sides of the latter against the lateral stop faces of the tool-holder and the base of said insert against the bearing face of said tool-holder.
This invention relates to a device for relea-sably clamping a cutting insert on a tool-holder, device comprising a screw of which the threaded shank adapted to be screwed in a tapped hole in the tool-holder passes through an eccentric cylin-drical hole in the insert. According to the inven-tion, the head of the screw comprises, from the shank, a truncated bearing surface, a cylindrical bearing surface and a shoulder, adapted to cooperate with the edge and the wall of the eccentric hole in the insert, to press the sides of the latter against the lateral stop faces of the tool-holder and the base of said insert against the bearing face of said tool-holder.
Description
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The present invention relates to a machine too holder and in particular a device for releasably clamping a cutting insert on a tool holder.
A device of this type is known, particularly from French Patent No. 2 109 189. The tool holder disclosed therein presents a bearing face and two stop faces in dihedral form perpendicular to said bearing face, in order to receive the insert. This known device comprises a screw of which the threaded shank adapted to be screwed in a tapped hole in the tool holder, passes through a cylindrical hole in the insert which is eccentric when the latter is suitably positioned in contact with the faces mentioned abov~
and without the wall of this eccentric hole touching the shank of the screw. The head of this screw presents a truncated bearing surface cooperating with an annular portion of a likewise truncated bearing surface bordering the eccentric hole of the insert in order to press the side thereof against the stop faces of the tool holder and concomitantly to clamp said insert against the bearing face of said tool-holder.
The present invention improves this clamping so that the insert is perfectly fast with the too holder and that no vibration appears therebetween under the effect of the stresses to which said insert is sub;ected during cutting.
According to the present invention there is provided a machine tool holder, comprising: the tool holder having a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hold formed therein and extending to a depth therein rom the bearing surface, said tool holder ~urther including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an 1~1'D~3~8 undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole loca-ted such that when the insert is positioned iQ the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hold is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in sequence beginning from the shank end of the screw head between the surfaces, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equival~nt to the diameter of the shank and extending from the first interface over a length of the screw head to a second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfacing the truncated bearing surface at a second interface and having a substantially constant diameter equivalent to the second diameter of the truncated surface at the second interface, and a third head portion having a shoulder interfacing the cylindrical bearing surface at a third interface havlng a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the cylindrical surface and fro~ the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hold having an insert hold diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portlon of the screw head; the dimensions of said first, second and third head portions and said shank being of a magnitude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder :35 hole threads without substantial deformation of the screw and ~3368 with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portlon of the screw head contacts a first outer edge of the insert hole, causing the shank s to bend away from the at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder, and such that further tightening of the screw causes the cylindrical bearing surface at the second interface to contact said first outer edge of the cylindrical hole wherein, as the screw is further tightened, the second head portion continues to contact the cylindrical hole, shortening a bending overhand distance said bending overhang distance being the distance between the point where the side of the screw shank first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole while maintaining a constant camber distance between the threaded shank and the second head portion in order to ~urther bend the shank away from the at least one stop face of the tool holder and thereby increase the force of the at least one insert side surface against the at lease one stop surface of the tool holder; and such that still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole to clamp the insert down against the bearing face of the tool holder.
Thus in accordance with the invention, the screw head comprises, from the shank, in order to constitute a contact surface with the : insert, a truncated bearing surface of short longitudinal extent which is provided, by cooperating with the edge of the eccentric hole in the insert to bring the or each side of said insert towards the or each stop face of the tool holder and to begin to clamp them against one another, causing the shank of the screw to bend, a~substantially cylindrical bearing face which is provided, by cooperating with the wall of the eccentric hole in the insert, to press said sides further against said faces, shorten~n~ the ~35 bending overhang (p) of said shank for a substantially constant - ~a -~`.
~L~9~3~
camber, and a shoulder projecting from the eccentric hole in the insert and which is provided to clamp the latter against the bearing face of the tool holder.
The shoulder of the screw head is advantageously truncated and provided, by cooperating with the eccentric edge of the insert, to press said insert progressively against the bearing face of the tool holder.
The or each stop face of the tool holder is, between the recess located near the bearing face and its or their outer edge, in undercut of between 15 minutes and 1 degree for the sides of the insert to ~ear firstly against the outer edge of the or each stop face.
Thus according to one embodiment of the present invention said shoulder is truncated and said truncated portion of said shoulder cooperates with the second edge o$ said at least one insert side surface to force the insert against the bearing face. Suitably the axial location of the third diameter is further from the shank than axial location of the second diameter and wherein said at least one stop face of the tool holder is recessed at the end proxlmate the bearing surface. Desirably said shoulder 1s truncated and the slope of the truncated shoulder is about twenty degrees relative to the axis of the screw so that the clamping of the insert against the tool holder is progressive.
In another embodiment of the present invention said undercut angle between said at least one top surface of the tool holder and said at least one insert side surface is about 15 minutes to about one degree so said at least one insert side surface bears first against the edge of said at lease one stop surface.
Suitably said undercut angle is about thirty minutes. Desirably at least one stop face of the tool holder is recessed at the end proximate said bearin~ surface.
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:
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In a further embodiment of the present invention said truncated bearing surface has a slope of from about forty-two to about forty-four degrees wi-th respect to the surface of the second head portion.
The present inventlon further provides a tool holder havin~ means for holding a cuttin~ insert comprising: a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hole formed therein and extending to a depth therein from the bearing surface, said tool holder further including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole located such that when the insert is positioned in the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hole is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in : sequence beginning from the shank end of the screw head, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equivalent to the diameter of the shank and extending from the first interface over a length of the screw head to a . second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfaclng the truncated bearing surface at a second intPrface and having a substantially constant diameter equivalent to the second diameter - 2c -.
~L~33~
of the truncated surface of the second lnterface, and a -third head portion having a shoulder interfaclng the cylindrical bearing surface at a third interface having a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hole having an insert hole diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portion of the screw head; and the dlmensions of said first, second and third head portions and said shank being of a magnltude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder hole threads without substantial deformation of the screw and with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portion of the screw head contacts a first outer edge of the insert hole, causing the shank to bend away from at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder; and such that further tightening of a screw causes the cycling bearing surface at the second interface to contact a first outer edge of the cylindrical hole wherPin as the screw ~s further tightened, the second head portion continues to contact the cylindrical hole, shortening bending overhang distance said bending overhang dlstance being the distance between the point where the side of the screw shank that first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole whlle maintaining a constant camber distance between the threaded shank and the second head portion in order to further bend the shank away from the at one stop face of the tool holder and thereby increase the force of the at least one insert side surface against said at least one stop surface of the tool : 35 holder; still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole - 2d -, ,,.~,,~
~,~
~3~8 to clamp the insert down against the bearing face of the tool holder and wherein said at least one stop face of the tool holder is recessed at the end proximate the bearing surface.
The invention will be more readily understood on reading the following descrlption with reference to the accompanying drawings, in which:
fig. 1 is a plan view of a tool holder on which a cutting lnsert is fixed by means of the device of the invention;
Fig. 2 is a section on a larger scale along line II-II of Fig. l;
Figs. 3 to 5 are partial views similar to Fig. 2 shown on a larger scale in synoptic view - 2e -~:933~
to illustrate the mode of intervention, phase after phase, of the clamping screw.
Referring now to the drawlngs, Figs. 1 and 2 firstly show the cut-ting insert 1 positioned in a housing 2 in a tool-holder 3 and it is question of clamping it firmly and precisely without clea-rance in said housing relatively to said tool-holder.
In the embodiment shown, the insert 1 presents the form of a straight prism with a diamond-shaped 10 base and consequently its base ~ i.s normally placed on a bearing face 5 of the housing 2 of the tool-holder, whilst its sides 6 and 7 are applied against the stop faces 8 and 9 respectively of said housing.
A tapped hole 10 is machined in the tool-15 holder 3 perpendiculary to the bearing face 5 and substantially at the centre of the insert 1. This latter defines a c~lindrical hole 11 (Figs. 2 to 5) of which the axis 12 is eccentric with respect to the axis 13 of the tapped hole 10 when the sides 20 6 and 7 of said insert are in contact with the stop faces 8 and 9 of the housing 2 of the tool-holder 3. In this position, the threaded shank 14 of a clamping screw 15 does not touch the wall of the hole 11 in the insert when said shank is : 25 screwed in the tapped hole 10 and the head 16 of said screw is located outside this hole 11 (Fig.
The present invention relates to a machine too holder and in particular a device for releasably clamping a cutting insert on a tool holder.
A device of this type is known, particularly from French Patent No. 2 109 189. The tool holder disclosed therein presents a bearing face and two stop faces in dihedral form perpendicular to said bearing face, in order to receive the insert. This known device comprises a screw of which the threaded shank adapted to be screwed in a tapped hole in the tool holder, passes through a cylindrical hole in the insert which is eccentric when the latter is suitably positioned in contact with the faces mentioned abov~
and without the wall of this eccentric hole touching the shank of the screw. The head of this screw presents a truncated bearing surface cooperating with an annular portion of a likewise truncated bearing surface bordering the eccentric hole of the insert in order to press the side thereof against the stop faces of the tool holder and concomitantly to clamp said insert against the bearing face of said tool-holder.
The present invention improves this clamping so that the insert is perfectly fast with the too holder and that no vibration appears therebetween under the effect of the stresses to which said insert is sub;ected during cutting.
According to the present invention there is provided a machine tool holder, comprising: the tool holder having a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hold formed therein and extending to a depth therein rom the bearing surface, said tool holder ~urther including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an 1~1'D~3~8 undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole loca-ted such that when the insert is positioned iQ the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hold is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in sequence beginning from the shank end of the screw head between the surfaces, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equival~nt to the diameter of the shank and extending from the first interface over a length of the screw head to a second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfacing the truncated bearing surface at a second interface and having a substantially constant diameter equivalent to the second diameter of the truncated surface at the second interface, and a third head portion having a shoulder interfacing the cylindrical bearing surface at a third interface havlng a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the cylindrical surface and fro~ the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hold having an insert hold diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portlon of the screw head; the dimensions of said first, second and third head portions and said shank being of a magnitude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder :35 hole threads without substantial deformation of the screw and ~3368 with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portlon of the screw head contacts a first outer edge of the insert hole, causing the shank s to bend away from the at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder, and such that further tightening of the screw causes the cylindrical bearing surface at the second interface to contact said first outer edge of the cylindrical hole wherein, as the screw is further tightened, the second head portion continues to contact the cylindrical hole, shortening a bending overhand distance said bending overhang distance being the distance between the point where the side of the screw shank first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole while maintaining a constant camber distance between the threaded shank and the second head portion in order to ~urther bend the shank away from the at least one stop face of the tool holder and thereby increase the force of the at least one insert side surface against the at lease one stop surface of the tool holder; and such that still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole to clamp the insert down against the bearing face of the tool holder.
Thus in accordance with the invention, the screw head comprises, from the shank, in order to constitute a contact surface with the : insert, a truncated bearing surface of short longitudinal extent which is provided, by cooperating with the edge of the eccentric hole in the insert to bring the or each side of said insert towards the or each stop face of the tool holder and to begin to clamp them against one another, causing the shank of the screw to bend, a~substantially cylindrical bearing face which is provided, by cooperating with the wall of the eccentric hole in the insert, to press said sides further against said faces, shorten~n~ the ~35 bending overhang (p) of said shank for a substantially constant - ~a -~`.
~L~9~3~
camber, and a shoulder projecting from the eccentric hole in the insert and which is provided to clamp the latter against the bearing face of the tool holder.
The shoulder of the screw head is advantageously truncated and provided, by cooperating with the eccentric edge of the insert, to press said insert progressively against the bearing face of the tool holder.
The or each stop face of the tool holder is, between the recess located near the bearing face and its or their outer edge, in undercut of between 15 minutes and 1 degree for the sides of the insert to ~ear firstly against the outer edge of the or each stop face.
Thus according to one embodiment of the present invention said shoulder is truncated and said truncated portion of said shoulder cooperates with the second edge o$ said at least one insert side surface to force the insert against the bearing face. Suitably the axial location of the third diameter is further from the shank than axial location of the second diameter and wherein said at least one stop face of the tool holder is recessed at the end proxlmate the bearing surface. Desirably said shoulder 1s truncated and the slope of the truncated shoulder is about twenty degrees relative to the axis of the screw so that the clamping of the insert against the tool holder is progressive.
In another embodiment of the present invention said undercut angle between said at least one top surface of the tool holder and said at least one insert side surface is about 15 minutes to about one degree so said at least one insert side surface bears first against the edge of said at lease one stop surface.
Suitably said undercut angle is about thirty minutes. Desirably at least one stop face of the tool holder is recessed at the end proximate said bearin~ surface.
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In a further embodiment of the present invention said truncated bearing surface has a slope of from about forty-two to about forty-four degrees wi-th respect to the surface of the second head portion.
The present inventlon further provides a tool holder havin~ means for holding a cuttin~ insert comprising: a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hole formed therein and extending to a depth therein from the bearing surface, said tool holder further including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole located such that when the insert is positioned in the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hole is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in : sequence beginning from the shank end of the screw head, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equivalent to the diameter of the shank and extending from the first interface over a length of the screw head to a . second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfaclng the truncated bearing surface at a second intPrface and having a substantially constant diameter equivalent to the second diameter - 2c -.
~L~33~
of the truncated surface of the second lnterface, and a -third head portion having a shoulder interfaclng the cylindrical bearing surface at a third interface having a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hole having an insert hole diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portion of the screw head; and the dlmensions of said first, second and third head portions and said shank being of a magnltude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder hole threads without substantial deformation of the screw and with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portion of the screw head contacts a first outer edge of the insert hole, causing the shank to bend away from at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder; and such that further tightening of a screw causes the cycling bearing surface at the second interface to contact a first outer edge of the cylindrical hole wherPin as the screw ~s further tightened, the second head portion continues to contact the cylindrical hole, shortening bending overhang distance said bending overhang dlstance being the distance between the point where the side of the screw shank that first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole whlle maintaining a constant camber distance between the threaded shank and the second head portion in order to further bend the shank away from the at one stop face of the tool holder and thereby increase the force of the at least one insert side surface against said at least one stop surface of the tool : 35 holder; still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole - 2d -, ,,.~,,~
~,~
~3~8 to clamp the insert down against the bearing face of the tool holder and wherein said at least one stop face of the tool holder is recessed at the end proximate the bearing surface.
The invention will be more readily understood on reading the following descrlption with reference to the accompanying drawings, in which:
fig. 1 is a plan view of a tool holder on which a cutting lnsert is fixed by means of the device of the invention;
Fig. 2 is a section on a larger scale along line II-II of Fig. l;
Figs. 3 to 5 are partial views similar to Fig. 2 shown on a larger scale in synoptic view - 2e -~:933~
to illustrate the mode of intervention, phase after phase, of the clamping screw.
Referring now to the drawlngs, Figs. 1 and 2 firstly show the cut-ting insert 1 positioned in a housing 2 in a tool-holder 3 and it is question of clamping it firmly and precisely without clea-rance in said housing relatively to said tool-holder.
In the embodiment shown, the insert 1 presents the form of a straight prism with a diamond-shaped 10 base and consequently its base ~ i.s normally placed on a bearing face 5 of the housing 2 of the tool-holder, whilst its sides 6 and 7 are applied against the stop faces 8 and 9 respectively of said housing.
A tapped hole 10 is machined in the tool-15 holder 3 perpendiculary to the bearing face 5 and substantially at the centre of the insert 1. This latter defines a c~lindrical hole 11 (Figs. 2 to 5) of which the axis 12 is eccentric with respect to the axis 13 of the tapped hole 10 when the sides 20 6 and 7 of said insert are in contact with the stop faces 8 and 9 of the housing 2 of the tool-holder 3. In this position, the threaded shank 14 of a clamping screw 15 does not touch the wall of the hole 11 in the insert when said shank is : 25 screwed in the tapped hole 10 and the head 16 of said screw is located outside this hole 11 (Fig.
3).
; The head 16~presents a particular shape : and comprises, from:the shank 14, a truncated bea-30 ring surface 17, a substantially cylindrical bearing surface 18 and a shoulder 19. These different parts 17 to 19 of the head are dimensioned wi.th respect to the diameter of the hole 11, to the offset "e"
of this hole relatively to the tapped hole 10, 35 to the diameter of the threaded shank 14 and to ~f~933~
the thicl~ness of the insert 1, for the screw 16 to intervene during screwing thereof in different successive phases illustrated in Figs. 3 to 5 and described hereinafter.
At the beginning of screwing tFig~ 3), the truncated bearing surface 17, of which the slope "a" with respect to the axis may be between 42 and 44 degrees, comes into contact with the arcuate part 20 of the outer edge of the hole 11, the closer 10 of the faces 6 and 7 and causes, by reason of its slope, firstly the placing in contact of the sides 6 and 7 of the insert with the stop faces 8 and 9 of the housing 2 of the tool-holder and then,~
when this contact is established, the bending of the shank 1~ of the screw 15 whose axis 13 begins to buekle as illustrated in Fig. 4 for the following phase. Consequently, the insert 1, by reaction to the elas-tic deformation of the shank 14, is firmly applied against the stop faces 8 and 9 of the housing 2 of the tool-holder.
Screwing is continued, bringing into contact with the arcuate part 20 of the outer edge of the hole 11, the cylind.rical bearing surEace 18 of the screw head 16 (~ig. 4). As screwing continues, : : 25 the point of contact 21 of this cylindrical bearing : :: surface 18 on the wall of the hole 11 moves closer to the bearing face 5 of the tool-holder. Consequent-:: ~: ly, the bending overhang "p" of the screw shank 14 deereases whilst the camber "f" remains substan-30 :tially constant; the overhang "p" is to be counted from the point oE contact 21 up to the bottom of milling l~a whlch is level with the bearing Eace 5 of~the tool-holder and in whieh the tapped hole 10 opens~out. Consequently, the elastic deformation of the screw shank 14 increases and the reaction ::
, ~z~33t;E3 oE the shan]c to such deformation increases, this having for its effect to increase the pressing force of the sides 6 and 7 of the insert against the stop faces 8 and 9 of the tool-holder.
~, At the end of screwing (Fig. 5), the shoulder 19 of the head abuts against the arcuate part 22 of the edge of the hole 11 opposite part 20 men-tioned above, which has for i-ts eEfect to ensure clamping of the insert 1 against the bearing face ]n5 of the tool-holder.
It may be advan-tageous, as shown in Fig.
5, if the shoulder 19 is truncated so that, due to its slope "b", clamping of the insert on the tool-holder is progressive. This slope may for 15example be 20 degrees.
It follows from the foregoing that, owing to the particul.ar shape of the head 16 of the~screw 15, this screw intervenes firstly to press the sides 6 and 7 of the insert 1 against the stop 20faces 8 and 9 of the tool-holder 3 and then to clamp the base 4 of said insert against the bearing face 5 of said tool-holder. These phases being successive, clamping of the insert is ensured under better conditions and so that said insert is perfect-25ly fast with the tool-holder.
Finally, for the flat fit of the insert on the tool~holder to be guaranteed, it may be advantageous to provide a recess 23 (Fig. 2) in the stop faces 8 and 9, flush with the bearing 30face 5.~Moreover, it may be advantageous to give these~stop faces 8~and~9 a small undercut "d" for the~sides~8 and 9 of the insert firstly to bear against the outer edge 24 of said stop faces. The undercut angle "d" may be between 15 minutes and 351 degree. It is preferably equal to 30 minutes.
; The head 16~presents a particular shape : and comprises, from:the shank 14, a truncated bea-30 ring surface 17, a substantially cylindrical bearing surface 18 and a shoulder 19. These different parts 17 to 19 of the head are dimensioned wi.th respect to the diameter of the hole 11, to the offset "e"
of this hole relatively to the tapped hole 10, 35 to the diameter of the threaded shank 14 and to ~f~933~
the thicl~ness of the insert 1, for the screw 16 to intervene during screwing thereof in different successive phases illustrated in Figs. 3 to 5 and described hereinafter.
At the beginning of screwing tFig~ 3), the truncated bearing surface 17, of which the slope "a" with respect to the axis may be between 42 and 44 degrees, comes into contact with the arcuate part 20 of the outer edge of the hole 11, the closer 10 of the faces 6 and 7 and causes, by reason of its slope, firstly the placing in contact of the sides 6 and 7 of the insert with the stop faces 8 and 9 of the housing 2 of the tool-holder and then,~
when this contact is established, the bending of the shank 1~ of the screw 15 whose axis 13 begins to buekle as illustrated in Fig. 4 for the following phase. Consequently, the insert 1, by reaction to the elas-tic deformation of the shank 14, is firmly applied against the stop faces 8 and 9 of the housing 2 of the tool-holder.
Screwing is continued, bringing into contact with the arcuate part 20 of the outer edge of the hole 11, the cylind.rical bearing surEace 18 of the screw head 16 (~ig. 4). As screwing continues, : : 25 the point of contact 21 of this cylindrical bearing : :: surface 18 on the wall of the hole 11 moves closer to the bearing face 5 of the tool-holder. Consequent-:: ~: ly, the bending overhang "p" of the screw shank 14 deereases whilst the camber "f" remains substan-30 :tially constant; the overhang "p" is to be counted from the point oE contact 21 up to the bottom of milling l~a whlch is level with the bearing Eace 5 of~the tool-holder and in whieh the tapped hole 10 opens~out. Consequently, the elastic deformation of the screw shank 14 increases and the reaction ::
, ~z~33t;E3 oE the shan]c to such deformation increases, this having for its effect to increase the pressing force of the sides 6 and 7 of the insert against the stop faces 8 and 9 of the tool-holder.
~, At the end of screwing (Fig. 5), the shoulder 19 of the head abuts against the arcuate part 22 of the edge of the hole 11 opposite part 20 men-tioned above, which has for i-ts eEfect to ensure clamping of the insert 1 against the bearing face ]n5 of the tool-holder.
It may be advan-tageous, as shown in Fig.
5, if the shoulder 19 is truncated so that, due to its slope "b", clamping of the insert on the tool-holder is progressive. This slope may for 15example be 20 degrees.
It follows from the foregoing that, owing to the particul.ar shape of the head 16 of the~screw 15, this screw intervenes firstly to press the sides 6 and 7 of the insert 1 against the stop 20faces 8 and 9 of the tool-holder 3 and then to clamp the base 4 of said insert against the bearing face 5 of said tool-holder. These phases being successive, clamping of the insert is ensured under better conditions and so that said insert is perfect-25ly fast with the tool-holder.
Finally, for the flat fit of the insert on the tool~holder to be guaranteed, it may be advantageous to provide a recess 23 (Fig. 2) in the stop faces 8 and 9, flush with the bearing 30face 5.~Moreover, it may be advantageous to give these~stop faces 8~and~9 a small undercut "d" for the~sides~8 and 9 of the insert firstly to bear against the outer edge 24 of said stop faces. The undercut angle "d" may be between 15 minutes and 351 degree. It is preferably equal to 30 minutes.
Claims (9)
1. A machine tool holder, comprising: the tool holder having a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hold formed therein and extending to a depth therein from the bearing surface, said tool holder further including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole located such that when the insert is positioned in the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hold is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in sequence beginning from the shank end of the screw head between the surfaces, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equivalent to the diameter of the shank and extending from the first interface over a length of the screw head to a second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfacing the truncated bearing surface at a second interface and having a substantially constant diameter equivalent to the second diameter of the truncated surface at the second interface, and a third head portion having a shoulder interfacing the cylindrical bearing surface at a third interface having a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the cylindrical surface and from the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hold having an insert hold diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portion of the screw head; the dimensions of said first, second and third head portions and said shank being of a magnitude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder hole threads without substantial deformation of the screw and with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portion of the screw head contacts a first outer edge of the insert hole, causing the shank to bend away from the at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder, and such that further tightening of the screw causes the cylindrical bearing surface at the second interface to contact said first outer edge of the cylindrical hole wherein, as the screw is further tightened, the second head portion continues to contact the cylindrical hole, shortening a bending overhand distance said bending overhang distance being the distance between the point where the side of the screw shank first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole while maintaining a constant camber distance between the threaded shank and the second head portion in order to further bend the shank away from the at least one stop face of the tool holder and thereby increase the force of the at least one insert side surface against the at lease one stop surface of the tool holder; and such that still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole to clamp the insert down against the bearing face of the tool holder.
2. The machine tool holder of claim 1, wherein said shoulder is truncated and said truncated portion of said shoulder cooperates with the second edge of said at least one insert side surface to force the insert against the bearing face.
3. The machine tool holder of claim 1, wherein the axial location of the third diameter is further from the shank than axial location of the second diameter and wherein said at least one stop face of the tool holder is recessed at the end proximate the bearing surface.
4. The machine tool holder of claim 3, wherein said shoulder is truncated and the slope of the truncated shoulder is about twenty degrees relative to the axis of the screw so that the clamping of the insert against the tool holder is progressive.
5. The machine tool holder of claim 1, wherein said undercut angle between said at least one top surface of the tool holder and said at least one insert side surface is about 15 minutes to about one degree so said at least one insert side surface bears first against the edge of said at lease one stop surface.
6. The machine tool holder of claim 5, wherein said undercut angle is about thirty minutes.
7. The machine tool holder of claim 6, wherein said at least one stop face of the tool holder is recessed at the end proximate said bearing surface.
8. The machine tool holder of claim 1, wherein said truncated bearing surface has a slope of from about forty-two to about forty-four degrees with respect to the surface of the second head portion.
9. A tool holder having means for holding a cutting insert comprising: a screw for holding a cutting insert to the tool holder; said tool holder including a bearing surface and having a threaded tool holder hole formed therein and extending to a depth therein from the bearing surface, said tool holder further including at least one stop surface extending from the bearing surface; said cutting insert having at least one insert side surface and an insert base surface adapted to contact said at least one stop surface and said bearing surface respectively, said at least one insert side surface and said at least one stop surface thereby forming an undercut angle, said undercut angle being the angle formed by the sides of the surfaces and the point of contact said insert having a cylindrical insert hole formed therein and extending entirely there through from the base surface, said tool holder hole and said insert hole located such that when the insert is positioned in the tool holder with the insert side and base surfaces in contact with the tool holder stop and bearing surfaces, the insert hole is eccentric to the tool holder hole; said screw having a threaded shank adapted to be inserted through the cylindrical hole of the insert and threaded into the tool holder hole, said screw further having a screw head including in sequence beginning from the shank end of the screw head, a first head portion having a truncated conical bearing surface interfacing the shank at a first interface and having a first diameter equivalent to the diameter of the shank and extending from the first interface over a length of the screw head to a second diameter larger than the first diameter, a second head portion having a cylindrical bearing surface interfacing the truncated bearing surface at a second interface and having a substantially constant diameter equivalent to the second diameter of the truncated surface of the second interface, and a third head portion having a shoulder interfacing the cylindrical bearing surface at a third interface having a diameter at the third interface equivalent to the second diameter of the cylindrical surface and from the third interface the diameter of the shoulder increases to a third diameter larger than the second diameter; said insert hole having an insert hole diameter of essentially constant magnitude over a portion of the length of the hole that may contact the first head portion of the screw head; and the dimensions of said first, second and third head portions and said shank being of a magnitude such that the threaded shank of the screw may be inserted through the insert hole and into the tool holder hole and engage the tool holder hole threads without substantial deformation of the screw and with the first portion of the screw head positioned outside of the insert hole and such that as the screw is tightened, the truncated bearing surface of the first portion of the screw head contacts a first outer edge of the insert hole, causing the shank to bend away from at least one stop face of the tool holder and pressing said at least one insert side surface against said at least one stop surface of the tool holder; and such that further tightening of a screw causes the cycling bearing surface at the second interface to contact a first outer edge of the cylindrical hole wherein as the screw is further tightened, the second head portion continues to contact the cylindrical hole, shortening bending overhang distance said bending overhang distance being the distance between the point where the side of the screw shank that first contacts the side of the tool holder hole and the point where the second head portion contacts the cylindrical hole while maintaining a constant camber distance between the threaded shank and the second head portion in order to further bend the shank away from the at one stop face of the tool holder and thereby increase the force of the at least one insert side surface against said at least one stop surface of the tool holder; still further tightening of the screw causing the shoulder to contact a second outer edge of the cylindrical hole to clamp the insert down against the bearing face of the tool holder and wherein said at least one stop face of the tool holder is recessed at the end proximate the bearing surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8618348A FR2608951B1 (en) | 1986-12-30 | 1986-12-30 | DEVICE FOR DEMOUNTABLE FIXING OF A CUTTING INSERT ON A TOOL HOLDER |
| FR8618348 | 1986-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1293368C true CA1293368C (en) | 1991-12-24 |
Family
ID=9342427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000555531A Expired - Fee Related CA1293368C (en) | 1986-12-30 | 1987-12-29 | Device for releasably clamping a cutting insert on a tool-holder |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4869624A (en) |
| EP (1) | EP0275793B1 (en) |
| JP (1) | JPH01171706A (en) |
| AT (1) | ATE65036T1 (en) |
| CA (1) | CA1293368C (en) |
| DE (1) | DE3771324D1 (en) |
| ES (1) | ES2025194B3 (en) |
| FR (1) | FR2608951B1 (en) |
| GR (1) | GR3002295T3 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9003705L (en) * | 1990-11-21 | 1992-05-22 | Seco Tools Ab | SKAERVERKTYG |
| US5647701A (en) * | 1995-12-13 | 1997-07-15 | Tempel; Daryl K. | Multiple spindle screw machine box tool insert holder |
| SE509324C2 (en) * | 1996-04-19 | 1999-01-11 | Seco Tools Ab | Tools for cutting machining |
| SE511759C2 (en) * | 1996-12-09 | 1999-11-22 | Sandvik Ab | Cutter holder for inserts |
| JP2007125649A (en) * | 2005-11-04 | 2007-05-24 | Konica Minolta Opto Inc | Cutting angle adjusting method in machining device, optical element forming metal mold and cutting tool |
| KR100754056B1 (en) * | 2005-11-21 | 2007-08-31 | 대구텍 주식회사 | Cutting Tool |
| SE529311C2 (en) * | 2005-12-05 | 2007-07-03 | Seco Tools Ab | A chip separation tool where the threaded joint is arranged to allow winding of the locking screw |
| US8616809B2 (en) * | 2007-01-17 | 2013-12-31 | James F. Farrell | Toolholder |
| JP5117138B2 (en) * | 2007-08-10 | 2013-01-09 | 日本特殊陶業株式会社 | Clamp holder |
| DE202008003866U1 (en) * | 2008-01-25 | 2008-05-29 | Präzisions-Drehteile Löcher GmbH | cutting tool |
| US20090238651A1 (en) * | 2008-03-24 | 2009-09-24 | Bill Nguyen | Adjustable center high tool holder head |
| AT11470U1 (en) * | 2009-06-10 | 2010-11-15 | Ceratizit Austria Gmbh | CUTTING TOOL |
| EP3041632B1 (en) * | 2013-09-03 | 2023-06-07 | No Screw Ltd. | Mounting mechanism for a cutting insert, a cutting insert therefor and a cutting tool using said insert |
| EP2954964B1 (en) * | 2013-09-06 | 2017-12-06 | Tungaloy Corporation | Mounting device for cutting tool, tool body, and cutting tool |
| US10307833B2 (en) | 2015-02-04 | 2019-06-04 | No Screw Ltd. | Cutting tool comprising a cutting tool holder and a cutting insert therefor |
| US10307832B2 (en) | 2015-04-30 | 2019-06-04 | No Screw Ltd. | Dynamic clamping mechanism |
| JP6382177B2 (en) * | 2015-12-17 | 2018-08-29 | 株式会社キンキ | Cutting blade of shearing type crusher and shearing type crusher having the same |
| DE102018206608B3 (en) | 2018-04-27 | 2019-06-27 | Siemens Schweiz Ag | Assessment of security situation by means of IoT activity detector |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3341920A (en) * | 1965-02-16 | 1967-09-19 | Gen Electric | Cutting tool |
| US3341923A (en) * | 1966-09-09 | 1967-09-19 | Gen Electric | Cutting tool |
| FR1562463A (en) * | 1967-04-18 | 1969-04-04 | ||
| GB1232024A (en) * | 1967-04-18 | 1971-05-19 | ||
| DE1602721A1 (en) * | 1967-09-14 | 1970-05-14 | Krupp Gmbh | Cutting tool |
| FR2109189A5 (en) * | 1970-10-04 | 1972-05-26 | Stellram Sa | |
| US3747179A (en) * | 1971-05-26 | 1973-07-24 | N Lovendahl | Tool holder arrangement |
| GB1385251A (en) * | 1971-09-30 | 1975-02-26 | Metallcutting Tools | Cutting tool having a locking ping for clamping an indexable cutting insert to an insert holder |
| US4397592A (en) * | 1980-11-10 | 1983-08-09 | Kennametal Inc. | Insert holder and method of holding |
| SU1207639A2 (en) * | 1984-09-19 | 1986-01-30 | Предприятие П/Я М-5287 | Cutting tool |
| US4632593A (en) * | 1985-02-25 | 1986-12-30 | Gte Valeron Corporation | Pin lock insert holder |
| SU1315153A1 (en) * | 1986-01-20 | 1987-06-07 | Всесоюзный Научно-Исследовательский Инструментальный Институт | Cutting tool |
-
1986
- 1986-12-30 FR FR8618348A patent/FR2608951B1/en not_active Expired - Fee Related
-
1987
- 1987-12-21 US US07/135,258 patent/US4869624A/en not_active Expired - Fee Related
- 1987-12-24 AT AT87402986T patent/ATE65036T1/en not_active IP Right Cessation
- 1987-12-24 ES ES87402986T patent/ES2025194B3/en not_active Expired - Lifetime
- 1987-12-24 DE DE8787402986T patent/DE3771324D1/en not_active Expired - Fee Related
- 1987-12-24 EP EP87402986A patent/EP0275793B1/en not_active Expired - Lifetime
- 1987-12-25 JP JP62327523A patent/JPH01171706A/en active Pending
- 1987-12-29 CA CA000555531A patent/CA1293368C/en not_active Expired - Fee Related
-
1991
- 1991-07-11 GR GR91400949T patent/GR3002295T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE3771324D1 (en) | 1991-08-14 |
| ES2025194B3 (en) | 1992-03-16 |
| JPH01171706A (en) | 1989-07-06 |
| FR2608951B1 (en) | 1994-05-06 |
| GR3002295T3 (en) | 1992-12-30 |
| US4869624A (en) | 1989-09-26 |
| ATE65036T1 (en) | 1991-07-15 |
| EP0275793A1 (en) | 1988-07-27 |
| FR2608951A1 (en) | 1988-07-01 |
| EP0275793B1 (en) | 1991-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |